Comcast, which increased its stock buyback program to $10 billion last quarter, said it would now earmark $6.75 billion for 2015, higher than the $4.25 billion it had previously set aside for the year.

Comcast, which abandoned its proposed $45 billion merger with Time Warner Cable in late April, said on Monday its total revenue rose 2.6 percent to $17.9 billion in the quarter ended March 31.

Last month, Comcast CEO Brian Roberts told CNBC that it was "time to move on" from the deal, adding that the company now has "room for further stock buybacks."

Advertising revenue at cable networks fell 5 percent in the quarter to $851 million amid a decline in ratings that has hit networks across the TV industry. The NBC broadcast network's ad revenue dropped 16 percent to $1.54 billion.

Revenue at the film studio rose 7 percent from a year earlier to $1.45 billion, bolstered by its blockbuster "Fifty Shades of Grey" film.

(Disclosure: Comcast is the owner of NBCUniversal, the parent company of CNBC and CNBC.com.)

—CNBC's Terri Cullen and Reuters contributed to this report.

CLARIFICATION: This story was updated to reflect that Comcast earned 81 cents a share in the quarter, topping analysts' estimates of 74 cents a share.